GNU FreeDink is a portable and enhanced version of
the Dink Smallwood game engine. It aims at running
the original game as well as its D-Mods (Dink
MODules, or add-ons), with close compatibility,
under new platforms. The internals of the engines
are being cleaned up to allow for portability and
later improvements.

Vendetta Online is a multi-platform 3D space-combat MMO for Windows, Mac, Linux/32 and Linux/64. The game permits players to interact in a vast online galaxy; fighting, trading, and mining their way to success. A "twitch" type real-time combat model makes true player skill the deciding factor instead of character advancement. Massive capital-ship battles shake the foundations of the major nations at war, while others struggle to push back the encroachment of the AI "Hives". A no-strings free trial is available.

Crossfire is a multi-player graphical arcade and adventure game made for X. It has certain flavours from other games, especially Gauntlet and the rogue-like games (Nethack, Moria, Angband, and Ragnarok). Any number of players can move around in their own window, finding and using items and battling monsters. They can choose to cooperate or compete in the same world.

RainbruRPG is a 3D multiplayer Role Playing Game project based on Ogre3D and CEGUI. It is based on an Object Oriented design through C++ and Ruby modules and a community-oriented concept through a wiki.

OpenMW is an attempt to reimplement the popular role playing game Morrowind. It aims to be a fully playable implementation of the game that will run on Linux, Windows, and Mac OS X. No game data is distributed with the code; the user must already own a copy of Morrowind to use the software.

Erebus is a 2D real-time role-playing game with three quests and random dungeons. It is a classic point-n-click style RPG, with dungeons to explore, enemies to fight, NPCs to talk to, sub-quests to complete, scenery to interact with, weapons, treasure, and other items to find.

Stendhal is a multiplayer online adventure game (MMORPG) developed using the Arianne game development system. It features a rich and expanding world in which you can explore towns, buildings, plains, caves, and dungeons. You will meet NPCs and acquire tasks and quests for valuable experience and cold hard cash. Your character will develop and grow, and with each new level up become stronger and better. With the money you acquire, you can buy new items and improve your armour and weapons. You can also roam the world in search of evil monsters (and kill them).

JURPE (Java Universal Role Playing Engine) is a
Java API to support the development of computer
RPG games based on a skill-based, three dice RPG
system. It comes with a small Swing demo featuring
a medieval warrior exploring randomly generated 2D
dungeons.

Turn Watcher is a tool based on Dungeons & Dragons rules. It is used to track the initiative of your players and monsters. It includes an option to roll initiative on every round, roll will, listen, and spot, and it has a status column that shows you the current status of your players. When you enter a player or monster, you also enter all of its modifiers, so the computer can take care of
rolling all the dice for you. Still want to roll initiative? You can simply order the characters with the Move Up and Move Down options.